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Journal of Cell Science, Vol 10, 267-305, Copyright © 1972 by Company of Biologists

Submitted on July 19, 1971

Chloroplast Ribosome Deficient Mutants in the Green Alga Chlamydomonas Reinhardi and the Question of Chloroplast Ribosome Function

J. E. BOYNTON 1, N. W. GILLHAM 1, and J. F. CHABOT 1

1 Departments of Botany and Zoology, Duke University, Durham, North Carolina 27706, U.S.A.

The 2 chloroplast ribosome deficient mutants of Chlamydomonas reinhardi, ac-20 and cr-I form low levels of 66-s and 70-s chloroplast ribosome monomers compared to wild type, but differ in that cr-I also accumulates substantial amounts of the large (54-S) chloroplast subunit. Unlike wild type, ac-20, cr-I and the double mutant ac-20 cr-I make little or none of the CO2- fixing enzyme ribulose diphosphate carboxylase (RuDPCase) when grown in the light with acetate and CO2 as carbon sources (mixotrophic growth) whereas all 3 mutant genotypes form at least some enzyme when grown photosynthetically with CO2 as the sole carbon source (phototrophic growth). All 3 mutant genotypes also show a characteristic defect in the organization of their chloroplast lamellar system when grown mixotrophically, but their chloroplast membrane organization approaches that of wild type when grown phototrophically. No change in the level of chloroplast ribosomes accompanies these changes in chloroplast organization and RuDPCase formation. We propose that the pleiotropic effects on chloroplast structure and function in mixotrophically grown cells of the mutants result because their chloroplast ribosomes synthesize certain specific chloroplast components with low efficiency, whereas they perform this function with greater efficiency when the cells are grown phototrophically.

Submitted on July 19, 1971




This article has been cited by other articles:


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 J. Biol. Chem.Home page
C. R. Hauser, N. W. Gillham, and J. E. Boynton
Translational Regulation of Chloroplast Genes
J. Biol. Chem., January 19, 1996; 271(3): 1486 - 1497.
[Abstract] [Full Text] [PDF]


© The Company of Biologists Ltd 1972